Method of making covered-joint hinge members



June 10,1930. s, B, ATWOQD 1,763,337

METHOD OF MAKING COVERED JOINT HING'E MEMBERS Filed July 5, 1927 Patente c lJune 10, 1930 a 1 UN [TE 1 AT j Applicaticn filed July 5,

knuckle joint, i i

-The primary purpose of the present invention is to provide an improved covered joint hinge member and an improved mething economy in the cost of manufacture and to producing a hinge member of this kind that will meet the commercial requirements. Infurtherance of these general objects my inventionfcontemplatesthe provision of a blankhavinga profile or cross-sectionfapproximately that of the hinge memberin its normal operative condition but having a part of itscoverportion disposediat one side a a of its normal position to permit of slotting j the knuckle by a milling operation andin subsequently bending the said cover part to j a its normal position overreaching-the slotted 1 side of the knuckle. Thisconstruction and "method of manufacture are advantageous and desirable for reasons which will be apparent from the following description; f Referring to the drawings; Figure 1 isga side view of the hinge member blank; a Figs. 2 and 3*show first and secondmilling operations; 1 Fig. [4c is a side view"showin.g the comi pletedhinge; and, v y

Fig. 5 is atop view of the hinge shown injFigJ4. a a mThe manufacture of myimproved jhinge starts with producing it section approxi mately as shown iinFig; 1.; This may be a rolled section or it mayj be produced by forging. In the event that the section is rolledfthe individualfhinge member will be 'eut oi sawed olf to the proper width. It will i be noted that this section is characterized by a flat strapportion 6, a knuckle portion 7 offset fromthe strapportion, an ektensionB providing a stop 9 against which for limiting the opening-movement of the door', and" an ex te'nsion 11' at the 'outer side lforms an enclosure for one side of the 0d ofmaking the same with a view to secur- 7 aid part 11 a the inside hinge member is adapted to strike FATE "sErH B. Arwoon, or ROCKFORD, rumors METHOD ornaxme covnnnn qonwr amen MEMBERS 1927; Serial N6. 293,429.

of the hinge member providing a part of y the cover portion whichis adaptedto overdisposed at onesideof its normal position in a order to permit of slotting theknuckle as by a milling operation to provide the knuckle bearing surfaces 12. i 1 i "The knuckle portion 7 is slotted at it innerside preferably by'means of a milling i,

cutter such as indicated by the dotted line 13, Fig. 3. This slotting maybe performed in any suitable manner although it ispracticalto use a milling cutter of approximately the diameter 1 shown in comparison with the size of the blank profile and to 1 mill to such depth as to leave a body thickness corresponding with that of the strap portion and gradually reducing or tapering towardthe endof the cover portion as shown in Fig. 3. This milling operation leaves the bearing surfaces; 12 parallel and accurately finished. i i Subsequent to the slotting or milling operationthe cover part 11 will be pressed or i bentbackagainst the knuckle proper soas to form a continuation of the outer curvature thereof and to overreach and enclose the knuckle joint. When this cover portion is properlypressed into position it will retain its shapeand location because of its substantial integral connection with the 'blankfroin side to side thereof. Saidpart -11 willbeypressed down against the curved endl lof the knuckle proper,in this instance the extension 8 thereof, and the end i 16 of willbe disposed adjacent to thestop 9. r

Prior-to the bending of the part 11 to its normal operative position a milling operation maybe performed to finish the surfaces 14 and 15 in order to gfacilitatefthe makingof a good joint betweenthese parts. This milling operation may be performed by a form milling cutter whichifdesired may also *beshaped to finish thestop face9, the end 16 and a portion of theend 17 of the knu'ckleprOpenQ Suchoperation is not however essential" and, furthermore, sub- -stantially the same result may be obtained knuckle to provide bearing surfaces for the knuckle of the inner hinge member, and bending the narrow extension inwardly against the first mentioned extension of the knuckle. a i V a 9. The method of making the outer member of a covered joint hinge in one piece consisting in forming a blank to a cross-section approximately that of the finished hinge member, said blank comprising a strap portion, a knuckle portion offset therefrom, 3 an extension at the outer end of the knuckle portion havinga stop abutment at itsinner side, and a narrow extension at the outer to form apart of the cover for the knuckle a joint, milling the knuckle end of the blank it longitudinally relative to the knuckle to provide finished surfaces on the inside of the narrow extension, and a cooperating finislied surface on the outside of the first mentioned extension, the said narrow extension being then 'of sufiicient length to terminate at the stop abutment when the said exten sion issubsequently bent against the knuckle, slotting the knuckle proper to provide bearing surfaces for the knuckle of the inner hinge member, and bending the narrow extension inwardly against the first mentioned extension of the knuckle so as to seat the finished inner surface of the narrow extension on i the finished outer surface of the first mentioned extension. it Inwitness of the foregoing I aflix my signature; 4 t t i B. ATWOOD.

cover a for the knuckle joint, slotting the i i end of the/first mentioned extension adapted 

